Fuzion • Idioms • Idiom # 332 List of the keys of a map

Idiom # 332 List of the keys of a map

Code

The following example shows how to create a map with integer keys and string values in Fuzion. The keys are collected into a list and printed one by one in a loop.

m := container.map_of

k := m.keys


for a in k do

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m := container.map_of
k := m.keys
for a in k do
 
 
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What are effects?

Runnable Code

ex322 is

# Create a map with integers as keys (1-4)

m := container.map_of [
  (1, "P=NP(?)"),
  (2, "The Hodge Conjecture"),
  (3, "The Poincare Conjecture"),
  (4, "The Riemann Hypothesis")
]

# Create keys to a list
k := m.keys

# Go through each key in a loop
for a in k do

  say "Key: {a}"

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ex322 is
# Create a map with integers as keys (1-4)
m := container.map_of [
  (1, "P=NP(?)"),
  (2, "The Hodge Conjecture"),
  (3, "The Poincare Conjecture"),
  (4, "The Riemann Hypothesis")
]
# Create keys to a list
k := m.keys
# Go through each key in a loop
for a in k do
  say "Key: {a}"
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

What are effects?

last changed: 2025-05-13

next: NYI: Idiom # 333 Pretty-print object in JSON